Compilare: main.cpp: In function 'void insert(std::__cxx11::string&)': main.cpp:119:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp: In function 'int query(std::__cxx11::string&)': main.cpp:131:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:162:6: warning: unused variable 'id' [-Wunused-variable] int id; ^~ main.cpp:140:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sabin.in","r",stdin); ^ main.cpp:141:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sabin.out","w",stdout); ^ main.cpp:142:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] ri3(n,k,m); ^ main.cpp:143:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] ri2(p,q); ^ main.cpp:166:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] ri(x); ^ main.cpp:170:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] ri(a[i]); ^